P0121 Chevrolet - Silverado 5.3 throttle position issue

Question

Had code read at auto parts store. Engine light has turned off. Don't think is was turned off by tech.

Should I try to do something before major occurs or wait to see if engine light returns?

Answer 1

P0121 Throttle position sensor circuit range performance

The TPS sensor is part of the throttle body, you can try a intake and throttle body cleaning with a MAF sensor cleaning,